Vol. XXJx] ENTOMOLOGICAL NEWS. IQ 



2. Workers with distinct mid-dorsal thoracic carina extending from, 

 the center of the pronotum to the center of the mesonotum, 



lineolata Say. var. lutea 



Workers with a distinct, short, mid-dorsal thoracic carina extend- 

 ing partly or throughout the mesonotum lineolata Say. 



C. victima F. Smith, subsp. missouriensis. 



This is a small species which may be distinguished by the 

 absence of a mid-dorsal thoracic carina. on the workers. 



C. lineolata Say, var. lutea. 



The workers have a distinct mid-dorsal thoracic carina ex- 

 tending from the middle of the pronotum to the middle of the 

 epinotum. 



C. lineolata Say. 



The workers of this species are very common, ranging 

 throughout all parts of the United States. They build nests 

 under stones, in galls, wood and under carton-like structures. 

 These ants are exceedingly fond of sweets and it is no uncom- 

 mon occurrence to find them in attendance upon aphids, coc- 

 cids and similar insects. The workers when disturbed raise 

 the tip of their gaster in a threatening manner as if they could 

 sting. 



Genus Leptothorax Mayr. 



I. Thorax without meso-epinotal constriction; antennae eleven-joint- 

 ed; color yellow, .curzrispinosus (Subgenus Leptothorax s. str.) 

 Thorax with distinct meso-epinotal constriction; antennae twelve- 

 jointed; color black, .pcrgandei (Subgenus Dictothora.v Emery) 



L. curvispinosus Mayr. 



The small yellow workers of this species build their nests in 

 hollow limbs, galls, nuts, etc. They are easily identified from 

 other species of this genus by their yellow color and by two 

 black or brown spots on the first gastric segment. The species 

 is very small and may be overlooked by the casual observer. 



L. pergandei Emery. 



The workers are black and considerably larger than those of 

 L. curvispinosus. The habits of the two species are practical- 

 ly the same. 



